Facile Fabrication of Flexible Electrodes and Immobilization of Silver Nanoparticles on Nanoscale Silicate Platelets to Form Highly Conductive Nanohybrid Films for Wearable Electronic Devices

Abstract

This study investigated films with remarkably high electrical conductivity after they were easily prepared from organic/inorganic nanohybrid solutions containing an organic polymeric dispersant and two-dimensional nanoscale silicate platelets as the inorganic stabilizer dispersed with silver nanoparticles. Transmission electron microscopy shows that the production of silver nanoparticles synthesized by the in situ chemical reduction of AgNO3 in an aqueous solution by N,N-dimethylformamide results in an average silver nanoparticle diameter of circa 20 nm. Thin films of silver nanoparticles were prepared on a 1-μm-thick film with a low sheet resistance of 8.24 × 10−4 Ω/sq, achieved through the surface migration of silver nanoparticles and prepared by sintering at 300 °C to form an interconnected network. This was achieved with a silver nanoparticle content of 5 wt%, using nanoscale silicate platelets/polyoxyethylene-segmented polyimide/AgNO3 at a weight ratio of 1:10:35. During sintering, the color of the hybrid film changed from gold to milky white, suggesting the migration of silver nanoparticles and the formation of an interconnected network. The results show promise for the fabrication of novel silver-based electrocardiogram electrodes and a flexible wireless electrocardiogram measurement system for wearable electronics.

Flexible Hybrid Electronics Nanofiber Electrodes with Excellent Stretchability and Highly Stable Electrical Conductivity for Smart Clothing

“…Following a previous study, the polymeric dispersant PIB–POE–PIB triblock copolymer was synthesized through amination and further imidization between PIB-SA and POE-2000 (molar ratio: 2:1), as shown in Figure S4 of the Supporting Information. − PIB-SA (25.0 g, 2 mol) was dissolved in THF (200 mL) in a three-necked round-bottom flask; then, POE-2000 (19.0 g, 1 mol, dissolved in THF (152 mL) in advance) was added dropwise, and a mechanical stirrer and thermocouple were used for mixing and heating, respectively. The mixture was allowed to react at 25 °C for 3 h under constant stirring before being analyzed by Fourier transform infrared spectroscopy (FT-IR), as shown in Figure S5 of the Supporting Information.…”

Immobilization of Air-Stable Copper Nanoparticles on Graphene Oxide Flexible Hybrid Films for Smart Clothes

“…Electrodes using the composition of nanosilver/dispersant/GO have demonstrated high conductivity. However, silver is expensive and the characteristics of air oxidation have not been addressed in detail [6,[41][42][43], while copper nanoparticles are hindered by safety concerns. Studies have shown that in 2013, Cohen et al [44] found that the toxicity of CuNPs firstly penetrate directly into cells from CuNPs, and secondly, Cu 2+ ions diffuse into the cytoplasm.…”

Enhanced Piezoelectric Properties of Poly(Vinylidenefluoride-Co-Trifluoroethylene)/Carbon-Based Nanomaterial Composite Films for Pressure Sensing Applications

“…Meanwhile, the interaction between the functional groups on the surface of the nanomaterial and PVDF (or its copolymers) can be harnessed to promote the β-phase [ 23 ], thereby improving the crystallinity and piezoelectric properties of PVDF (or its copolymers). In our laboratory, we have comprehensively studied the dispersion and stabilization of inorganic nanomaterials by polymeric dispersants [ 24 , 25 , 26 , 27 ]; the molecular structure of the polymeric dispersant has been used to interact with the inorganic nanomaterial via π–π stacking and lone pair interactions, thereby enhancing the dispersion and stability of the inorganic nanoparticle in solution. To our knowledge, no research has discussed the seismocardiography influence of carbon nanomaterials of different dimensions on piezoelectric polymers.…”